Fill box cap wrench



FIG. 1 is a top front perspective view of a fill box cap wrench showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top front perspective view of a second embodiment of FIG. 1;

FIG. 6 is a right side elevation view thereof, the opposite side being a mirror image;

FIG. 7 is a rear elevation view thereof; and,

FIG. 8 is a top plan view thereof.

The broken line showing of the environmental structure of a fill box cap wrench is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a fill box cap wrench, as shown and described. 